Sites that try to trick users into subscribing to browser notification spam are increasingly becoming a method used to promote unwanted extensions, fake software, adware bundles, adult sites, and scam sites.
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Scam sites like the one above are promoted through poisoned search results or adware redirects and tell users that they need to subscribe to the site in order access a service or watch a video. For example, in the image above the site states that the visitor must subscribe to notifications in order to view a video.
Once the users signs up for notifications, the site will either perform a redirect to another site or display the video. The visitor, though, will now receive spam browser notifications delivered directly to their desktop.